eae59ca2cd
Use static_cast<>() instead of reinterpret_cast<>() to perform downcasts, as reinterpret_cast<>() isn't meant (and guaranteed to be safe) for that purpose. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
155 lines
3.0 KiB
C++
155 lines
3.0 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* signal.h - Signal & slot implementation
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*/
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#ifndef __LIBCAMERA_SIGNAL_H__
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#define __LIBCAMERA_SIGNAL_H__
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#include <list>
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#include <vector>
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namespace libcamera {
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template<typename... Args>
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class Signal;
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template<typename... Args>
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class SlotBase
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{
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public:
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SlotBase(void *obj)
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: obj_(obj) { }
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virtual ~SlotBase() { }
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virtual void invoke(Args... args) = 0;
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protected:
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friend class Signal<Args...>;
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void *obj_;
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};
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template<typename T, typename... Args>
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class SlotMember : public SlotBase<Args...>
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{
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public:
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SlotMember(T *obj, void(T::*func)(Args...))
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: SlotBase<Args...>(obj), func_(func) { }
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void invoke(Args... args) { (static_cast<T *>(this->obj_)->*func_)(args...); }
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private:
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friend class Signal<Args...>;
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void(T::*func_)(Args...);
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};
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template<typename... Args>
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class SlotStatic : public SlotBase<Args...>
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{
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public:
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SlotStatic(void(*func)(Args...))
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: SlotBase<Args...>(nullptr), func_(func) { }
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void invoke(Args... args) { (*func_)(args...); }
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private:
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friend class Signal<Args...>;
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void(*func_)(Args...);
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};
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template<typename... Args>
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class Signal
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{
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public:
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Signal() { }
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~Signal()
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{
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for (SlotBase<Args...> *slot : slots_)
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delete slot;
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}
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template<typename T>
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void connect(T *object, void(T::*func)(Args...))
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{
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slots_.push_back(new SlotMember<T, Args...>(object, func));
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}
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void connect(void(*func)(Args...))
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{
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slots_.push_back(new SlotStatic<Args...>(func));
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}
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void disconnect()
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{
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for (SlotBase<Args...> *slot : slots_)
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delete slot;
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slots_.clear();
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}
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template<typename T>
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void disconnect(T *object)
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{
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for (auto iter = slots_.begin(); iter != slots_.end(); ) {
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SlotBase<Args...> *slot = *iter;
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if (slot->obj_ == object) {
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iter = slots_.erase(iter);
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delete slot;
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} else {
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++iter;
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}
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}
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}
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template<typename T>
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void disconnect(T *object, void(T::*func)(Args...))
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{
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for (auto iter = slots_.begin(); iter != slots_.end(); ) {
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SlotBase<Args...> *slot = *iter;
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/*
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* If the obj_ pointer matches the object types must
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* match, so we can safely cast to SlotMember<T, Args>.
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*/
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if (slot->obj_ == object &&
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static_cast<SlotMember<T, Args...> *>(slot)->func_ == func) {
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iter = slots_.erase(iter);
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delete slot;
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} else {
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++iter;
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}
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}
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}
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void disconnect(void(*func)(Args...))
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{
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for (auto iter = slots_.begin(); iter != slots_.end(); ) {
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SlotBase<Args...> *slot = *iter;
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if (slot->obj_ == nullptr &&
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static_cast<SlotStatic<Args...> *>(slot)->func_ == func) {
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iter = slots_.erase(iter);
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delete slot;
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} else {
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++iter;
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}
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}
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}
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void emit(Args... args)
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{
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/*
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* Make a copy of the slots list as the slot could call the
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* disconnect operation, invalidating the iterator.
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*/
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std::vector<SlotBase<Args...> *> slots{ slots_.begin(), slots_.end() };
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for (SlotBase<Args...> *slot : slots)
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slot->invoke(args...);
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}
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private:
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std::list<SlotBase<Args...> *> slots_;
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};
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} /* namespace libcamera */
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#endif /* __LIBCAMERA_SIGNAL_H__ */
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